This really nice HO gauge loco by Roco is 43661 a DB E18 electric loco in green livery. It has running number E18 28. 

The Deutsche Reichsbahn-Gesellschaft (DRG) Class E 18 is a class of electric locomotives built in Germany and Austria between 1935 and 1955. With exception of Class E 19 it was Deutsche Reichsbahn's fastest electric locomotive. After 1945 most of the surviving locomotives were operated by Deutsche Bundesbahn (DB), although a few passed to Deutsche Reichsbahn (DR) and Österreichische Bundesbahnen (ÖBB).

In addition to the 55 locomotives built in Germany, a further 8 locomotives of a modified design were built in Austria in 1939 as Class E 18.2 (later ÖBB class 1018). They were re-designated in the West BR118. 

Of the 55 Class E 18 locomotives built, six have been preserved.

The loco is in good condition as you can see in the pictures, it is fully tested and runs with working lights. It comes complete with its box. The box is in good if slightly shelf worn condition. 

Overall this is a really nice scale locomotive and would look fantastic on a layout.

Do please have a look at my other listings, I typically have various HO and OO locos on offer as well as an extensive range of imported N gauge locos and other items. 

Note: I do recommend all locos are cleaned & serviced, as they have some age to them even if the quality looks at the highest level (fairly standard advice for all locos!).